The section that contains the main circuit breaker (s) or service disconnect devices is referred to as a main section. The power distribution boxes deliver electricity from the main electrical main to other circuits. Main Distribution Board (MDB) 2. Unitized Panel. Learn what a Main Distribution Board (MDB) is, how it works, its key components, types, and why it's vital for safe, reliable power distribution in any setup. Ever wondered how electricity from the grid reaches every switch, socket, and appliance in a building—safely and in the right amount? That's. A panelboard is a distribution assembly designed to divide an incoming electrical feed into numerous smaller branch circuits.
